Study Mech

  Q-2.Consider any one of the metal forming operations and list out the important parameters involved during the process. Ans: Rolling is a metal working process. In rolling, the metal stock or billet is passed through a pair of rolls to reduce the thickness. During the rolling process, the width of the stock remains constant. The important parameters involved during the rolling process are, Diameter of rolls. Friction generation between workpiece and roll surface & Neutral plane position. Deformation resistance of metal and temperature of billet, etc. Diameter of rolls: In the rolling process, rolling force is directly proportional to the diameter of roll. Rolling force increases as the roll diameter. As a decrease in diameter of roll, length of arc of contact  also decreases. Hence, smaller diameter roll provides uniform reduction in thickness of billet. Hence, small diameter rolls are generally used in rolling purposes.  Larger rolls are used as back up rolls, hen...